2. After two or three days, the catfish is emptied of food. Take out the catfish and throw it head-down on the chopping board or sink. Smashing can make catfish faint and reduce their resistance. If the catfish doesn't faint after falling, it is suggested to directly hit the catfish head with the back of the knife to make it faint.
3. After the catfish passes out, put the catfish's stomach up, put two fingers into the catfish's gills and break them open. Then use your hand on the gills of the fish to make it easier to exert your strength. Screw off the catfish's spine directly. Breaking gills will suffocate catfish, while twisting the spine will directly make catfish unable to control their bodies and prevent their instinctive struggle. After that, you can gut the fish and throw away the internal organs.
4. Whether you buy killed fish from the market or kill catfish at home. Everyone must pay attention to cleanliness. When cleaning catfish, gills, blood stasis, fat and black membrane must be removed. These sundries all contain a strong earthy smell, which will especially affect the taste if they are not removed.
In addition to removing the above things, the mucus on the catfish body surface also needs to be removed. You can sprinkle some salt particles on the catfish's body surface, then spread them evenly all over the catfish and massage them all over. Salt can remove most mucus from catfish.
6. If you think that removing mucus with salt is not complete. You can scrub catfish again with flour or starch. Especially some corners, don't let go. After that, rinse with clear water. Mucus on the surface of catfish is removed. Remember to put some cooking wine when cooking catfish, which can also effectively remove fishy smell.